Found a lump on my left breast near the armpit. is this breast cancer?

Possibly: A new breast lump, even in a younger woman, needs to be thoroughly evaluated as it might be cancerous. Please see a doctor. The best place to start would probably be with a primary care physician like an ob/gyn, family practitioner, or internist. If you do not already have a doctor many communities have breast or women's health centers where you could potentially get care.

Don't neglect: To young, but any lump especially a newly discovered one in the breast around the breast should be checked out. See a physician and have he/she check it out clinically and if needed have a mammography! any family history? If yes, even more urgency!

Get checked out: You are toung but workup needs to start proper screening with self breast exams looking for new lumps, breast exams by your physician looking for skin or nipple chanes as well as masses or lymph nodes, and mammogram and ultrasound if needed are the best ways to pick up early stage breast cancer before it causes any symptoms. Once advanced it can cause many different symptoms throughout the body.